I could see a scenario where a disabled tank might be on the battlefield, possibly with the goal of taking it out (and having it still operational with an ultra dedicated soldier inside it) - in other words, it would be something like a building. But anything approaching armor movement rules would far outweigh their usefulness in scenarios at this scale.
Well, the boss isn't always right. But, he's always the boss.
Actually David Armor would be easier than you think. It would also highlight the Infantry flavor of the game. Unless the crew is exposed there visability would be limited to Turret facing and Tank commander facing. which vision block is he looking thru. The tank would become a big lumbering target without it's infantry support. Also tankers do not drive thru buildings or over stone walls. We don't want to have to put the track back on. So don't be afraid to add the tank. just don't add a whole company of them. :D